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@onyerbike
Also the above works if you only have a smart trainer but no power meter on your TT bike, which is great.
Last note, it's probably a bit involved to get into it but I think the whole 'push really hard into the headwind' and then 'save on th tailwind' is a good rule of thumb, but it's unfortunately not as simple as that. If I rode a course with a block headwind then these online tools would suggest to ride some unsustainable %FTP into the wind Vs the taily.